摘要
基于D30 TCI柴油机搭建国6后处理系统的试验台架,进行了不同碳载量下CDPF被动再生平衡点温度试验,研究了入口温度对CDPF被动再生的影响;探究了发动机DTI工况下CDPF主动再生特性并测评了其对载体捕集特性的影响。结果表明:碳载量对CDPF被动再生平衡点温度无明显影响,碳载量的升高可提高载体内部温度的均匀性,加快CDPF被动再生反应速率;入口温度对CDPF被动再生具有显著影响,入口温度由325提高至360℃时,再生效率达94%,再生速率为56 g/h,分别约提高1倍和18倍;DTI工况下CDPF主动再生时载体内部温度会出现“尖峰”现象,载体内部温度及温升速率在其后段中心处达到峰值;CDPF经多次DTI主动再生后其PM捕集效率无明显影响,但会导致PN捕集效率下降;4种排气污染物(HC、CO、PM、PN)在WHTC测试循环中均满足国6排放法规限值要求。
Based on the D30 TCI diesel engine,a test bench for the National 6 after-treatment system is built to carry out the CDPF passive regeneration equilibrium point temperature test under different soot loads so as to study the influence of the inlet temperature on the passive regeneration of the CDPF.The active regeneration characteristics of the CDPF under the engine DTI condition are explored and its influence on the capture characteristics of the carrier is evaluated.The results show that the carbon loading has no significant effect on the temperature at the equilibrium point of CDPF passive regeneration and the increase of carbon loading can improve the uniformity of the internal temperature of the carrier and accelerate the reaction rate of CDPF passive regeneration.The inlet temperature has significant effect on the passive regeneration of CDPF.When the temperature is increased from 325 to 360℃,the regeneration efficiency reaches 94%,and the regeneration rate is 56 g/h,which is increased by 1 and 18 times respectively.Under DTI conditions,during CDPF active regeneration,the internal temperature of the carrier will appear"peak".The internal temperature and temperature rise rate reach the peak at the center of the rear section.There is no obvious impact on the PM capture efficiency of CDPF after multiple DTI active regeneration,but the PN capture efficiency will decrease;and the four exhaust pollutants(HC,CO,PM,PN)in WHTC test cycle all meet the National 6 emission regulations and limits.
作者
李青
陈贵升
罗赢
贺如
张涵
施伟杰
Li Qing;Chen Guisheng;Luo Ying;He Ru;Zhang Han;Shi Weijie(Kunming University of Science and Technology,Yunnan Key Laboratory of Internal Combustion Engine,Kunming 650500;Unit 31638 of the Chinese People's Liberation Army,Kunming 650203)
出处
《汽车工程》
EI
CSCD
北大核心
2021年第10期1479-1487,1496,共10页
Automotive Engineering
基金
国家自然科学基金(51866004)资助。
关键词
柴油机
催化型微粒物捕集器
被动再生
DTI主动再生
国6法规
diesel engine
catalytic diesel particulate filter
passive regeneration
DTI active regeneration
nationalⅥregulations
